LiftMaster Screw Drive Garage Door Opener Coupler Replacement is an easy DIY. When the coupling that connects to the motor unit in your garage door opener is damaged or wears out, it’s easy and inexpensive to replace it with the LiftMaster screw drive sprocket coupler. The screw drive coupler is compatible with several LiftMaster and Chamberlain residential garage door openers manufactured after 1995.